Crestron's new DIN rail lighting modules, the DIN-4DIMU4 universal dimmer and the DIN-8SWU8 universal switch, are now shipping. For a London home with a centralised Crestron DIN rail lighting panel, they mean a smaller panel, dimmers built for LED and a faster, tidier installation.
Crestron announced that the modules are shipping in a blog post on 4 November 2026, The New DIN Rail Lighting Standard: Smaller, Faster, Smarter, an interview with Ben Slivka, the senior product manager behind them. We first wrote about the two modules when Crestron listed them in its Crestron Home 4.12 release notes; that earlier post on the Crestron DIN modules was written before any specification was published. Now the product pages are live, so here is what has actually arrived and what it means if you are renovating, extending or rewiring a London property.
What Crestron DIN rail lighting is, in plain terms
In most homes the dimmer sits behind the switch on the wall. In a house with centralised lighting, every lighting circuit runs back to one panel, usually in a plant room, a utility cupboard or under the stairs, and the dimming and switching is done there by modules clipped onto a metal DIN rail. The keypads in each room are then small, low voltage devices that tell the panel what to do.
That layout suits London houses well. Basements, lower ground floors and loft conversions tend to have plenty of downlights, wall lights and LED strip, and grouping the electronics in one ventilated panel keeps buzzing and heat out of the living spaces. It also means the wall plates can be slim keypads that match the rest of the joinery. You will find more on how we plan it on our Crestron lighting page.
The two new Crestron DIN rail modules
Crestron calls the pair the next phase of a programme to modernise its whole DIN rail range. The first step was the DIN-DLI, its DALI controller. These two cover the everyday work of dimming and switching.
| DIN-4DIMU4 universal dimmer | DIN-8SWU8 universal switch | |
|---|---|---|
| Channels | 4 dimming channels, each with its own feed | 8 switched channels, or 4 bidirectional motor channels |
| Rating at 230V | Up to 320 W per channel; bridge channels for up to 1,280 W | Up to 10A per channel for LED and resistive loads |
| Dimming method | Forward and reverse phase, chosen automatically | Not a dimmer: on and off, or motor up and down |
| Inputs | 4 digital inputs | 8 digital inputs, including 24VAC signals |
| Energy data | Real time current, voltage, power and kWh per channel | Estimated energy use per channel from a set load |
| Width | 6 DIN module spaces | 6 DIN module spaces |
The figures above come from Crestron's product pages for the DIN-4DIMU4 and the DIN-8SWU8. Both run from 100 to 230VAC, connect to the control system over Cresnet and work with Crestron Home OS.
Why the new modules matter for a London lighting panel
Half the space
The existing four channel dimmer, the DIN-1DIMU4, takes 12 module spaces on the rail. The DIN-4DIMU4 does four channels in 6. On the switching side, Slivka says one DIN-8SWU8 gives the same four motor channels as the two DIN-2MC2 modules it replaces, in half the enclosure space. In a London house where the panel has to fit in a cupboard that was never meant for it, that can be the difference between one enclosure and two.
Dimming LED without the guesswork
Older dimmers were designed for filament lamps, and some need a minimum load to work properly, which is why a single low wattage LED fitting can flicker, glow when off or refuse to dim smoothly. The DIN-4DIMU4 has no minimum load requirement and picks forward or reverse phase by itself. Crestron's own footnote is worth repeating: some LED loads still need more than one fitting on a channel to dim well, and it recommends two or more LED loads per dimming channel on any phase dimmer. We still test the fittings you have chosen before the ceilings go up.
A cleaner, faster installation
Both modules have module to module connectors that carry Cresnet and the override signal along the rail, toolless DIN rail mounting and spring terminals with pass through. Slivka says making the communication cables between modules could easily take three to five minutes a connection, and that with the new connectors it takes one second. Less wiring in the panel also leaves more room for the circuits themselves, which makes the panel easier to service later.
Setting up and testing before the processor arrives
Each module has buttons and coloured indicator lights on the front, so an installer can set the dimming mode, pair motor channels, bridge channels and set up the inputs without a laptop. The digital inputs control their own output by default, so a push button or a sensor wired to the module works straight away, with no processor. When the Crestron Home processor is brought online, the settings made on the module are synchronised with it.
On a London refurbishment that is useful. The electrician can prove every circuit while the trades are still on site, and the programming of scenes, keypads and the app can follow later without holding up the handover of the shell. It also means faults are found before the decorators have finished.
Blinds, motors and other uses for the switch
Pairs of channels on the DIN-8SWU8 can drive mains motors in both directions, for example motorised curtains, screens or shutters, with the two relays interlocked so they can never be energised together. Its inputs also accept 24VAC, so a standard thermostat can switch a mains load such as a fan or pump through the module. Crestron notes that the relays latch mechanically and hold their state through a power cut. If you are also planning shading, our page on motorised blinds covers the options.
What an existing Crestron owner should know
If your house already has a Crestron DIN rail panel, Crestron Home 4.12 lists support for both modules, so they can be added to a system running Crestron Home 4.12 or later when a panel is extended or a faulty older module is replaced. Whether it is worth changing modules that work is a judgement for each house: the gains are mostly in space, LED behaviour and energy data rather than in how the lights look day to day. We have not seen UK prices or stock dates published, so ask us for both before you plan around them.
If you are starting from scratch, the new modules make a centralised Crestron DIN rail system more compact and quicker to commission than before. Read our guides to lighting design for a London self build and smart home wiring for a renovation for what to decide before first fix.
Questions we are often asked
Are the new Crestron DIN rail modules available now?
Crestron said on 4 November 2026 that the DIN-4DIMU4 and DIN-8SWU8 are now shipping. We confirm stock and lead times when we quote.
Can the DIN-4DIMU4 dim any LED downlight?
Crestron lists LED, incandescent and magnetic and electronic low voltage loads, with forward and reverse phase dimming and no minimum load. Crestron still recommends two or more LED fittings per channel, and we test the actual fittings before installation.
Do I need a Crestron processor for the modules to work?
No for basic use: the digital inputs control their own outputs locally. For scenes, keypads, the app and schedules you need a Crestron Home system, which then picks up the settings already made on the modules.
How much smaller will my lighting panel be?
The new dimmer gives four channels in 6 module spaces where the DIN-1DIMU4 needs 12, so the dimming modules take roughly half the rail. The exact enclosure depends on how many circuits and motors the house has, and on ventilation.
Can I add the new modules to my existing Crestron system?
Crestron Home 4.12 supports them, so a system running Crestron Home 4.12 or later can take them. Older systems may need a processor or software upgrade first, which we check on a visit.
Planning a Crestron lighting panel or extending one? See our Crestron page and our lighting control in London service, or speak to our Crestron installer team in London.
Book a consultation or call our head office on 01344 937999 (London office 0208 064 0196).
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